Route on-time record
GRR to DEN: most on-time flights and the best time to fly
Grand Rapids (Gerald R. Ford International Airport) to Denver (Denver International Airport). 1,242 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was Southwest 3272 at 12:50 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
GRR → DEN
Grand Rapids to Denver: 1,242 nonstop flights a year
On time (12 months)
80%
Cancelled
0.3%
avg delay 15 min
Best time to leave
Noon to 3 PM
93% on time vs 69% 6 to 9 PM
Most reliable airline
Southwest
82% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 3272
12:50 PM → 1:40 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-30.
88%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Noon to 3 PM: 93% on time; 6 to 9 PM: 69%).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3272 fares Opens this date on Aviasales#2 · United 2745
3:43 PM → 4:41 PM3h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 79% of the time (87 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 87 flights
Find United 2745 fares Opens this date on Aviasales#3 · United 1407
9:00 AM → 10:01 AM3h 01m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1102, 1658; its record covers all of them.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 78% of the time (77 flights, Jun 2025 to May 2026).
- Never cancelled in 77 scheduled flights.
Moderate track record · 77 flights
Find United 1407 fares Opens this date on Aviasales#4 · United 2648
8:00 AM → 8:54 AM2h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 71%
- Cancelled
- 0.6%
- Avg arrival delay
- 23 min
- Arrived on time 71% of the time (154 flights, Jun 2025 to May 2026).
Moderate track record · 154 flights
Find United 2648 fares Opens this date on Aviasales#5 · Southwest 435
4:40 PM → 5:30 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-29.
72%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 67% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 435 fares Opens this date on Aviasales#6 · Frontier 1247
8:29 PM → 9:35 PM3h 01m nonstop
Local times, typical schedule. Last flown 2026-05-30.
72%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 75% of the time (117 flights, Jun 2025 to May 2026).
- Never cancelled in 117 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 69% on time; Noon to 3 PM: 93%).
Moderate track record · 117 flights
Find Frontier 1247 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines82%
367 flights · 83% on time as flown · 0.3% cancel
- United Airlines80%
728 flights · 80% on time as flown · 0.4% cancel
- Frontier Airlines73%
146 flights · 72% on time as flown · 0.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM88%
348 flights · avg delay 7 min
- 9 AM to noon79%
240 flights · avg delay 15 min
- Noon to 3 PM93%
46 flights · avg delay 4 min
- 3 to 6 PM76%
447 flights · avg delay 18 min
- 6 to 9 PM69%
156 flights · avg delay 22 min
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume35%
- Airline (crew, maintenance, boarding)32%
- Late-arriving aircraft27%
- Severe weather7%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
GRR to DEN questions
- What time of day is best to fly GRR to DEN?
- Noon to 3 PM: 93% of flights arrived on time, against 69% for departures 6 to 9 PM.
- Which airline is most on time from GRR to DEN?
- Southwest, with a season-adjusted 82% chance of operating and arriving on time over 367 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on GRR to DEN?
- January (65% on time); the best was October (90%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from GRR
- DEN to GRR (return)
- GRR to ORD 68%
- GRR to DTW 77%
- GRR to ATL 86%
- GRR to MSP 81%
- GRR to DFW 67%
- GRR to CLT 80%
- GRR to LGA 79%
- GRR to MDW 78%
- GRR to EWR 79%
- GRR to DCA 69%
- GRR to LAS 71%
- GRR to BWI 81%
Live status: FAA delays and ground stops